master-> 2 hot standbys

Hello,
Our current master 9.2 has two active standbys. Can you please help me out with the right sequence of events if we would like to promote one of current standbys to master and convert master to standby?

Your help is appreciated.

Thanks,
Julie

________________________________
From: Julie Nishimura
Sent: Thursday, February 28, 2019 6:00 PM
To: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: validation of hot standby

Hello,
We set up our hot standby by putting master into archive mode and issuing pg_basebackup command, and we are about to start our hot standby instance. What are the things you suggest for validation (assuming it will come up cleanly) and replication caught up?

What do I need to check in addition, making sure the data is clean and not corrupted?

thanks for your help